Realtek Semiconductor Inc.

Chi-Wang Chai

Wei Li

Weimin Zeng

Wujun Chen

Rong Zhang

Wei Pu

Wu-Jun Chen

Jing Wang

Wei-min Zeng

Yi-Shu Chang

Wei-Min Zeng

Qingxi He

Li Liu

Lingzhi Liu

Hsu-Jung Tung

Yi-Chen Tseng

Chao-An Hsieh

Qing-Xi He

Kai Wen Chuang

Xiao-Hua Xi

The present invention discloses an image decoding method. Error report information related to an error block in an N-th image frame generated according to an inter-frame coding technology is received by an image encoding apparatus at a time spot that the image decoding apparatus receives a corresponding block of an N+P−1-th image frame and an N+P-th image frame is encoded according to an inter-frame coding technology. Blocks in the N-th image frame before the occurrence of the error block are decoded according to the inter-frame coding technology. Motion vector information and residue information are set to be zero to decode the blocks from the error block to the N+P−1-th image frame according to the inter-frame coding technology. The motion vector information and the residue information of the inter-frame coding blocks in the N+P-th image frame are retrieved to decode the blocks therein according to the inter-frame coding technology.

Image decoding apparatus and method

The present invention discloses an image decoding method. Error report information related to an error block in an N-th image frame generated according to an inter-frame coding technology is received by an image encoding apparatus when the image decoding apparatus receives a block of an N+P−1-th image frame. The N+P-th image frame is encoded according to the inter-frame coding technology. Blocks in the N-th image frame before the error block are decoded according to the inter-frame coding technology. A panning motion vector of an N−1-th image frame serves as the motion vector information and the residue information is set to be zero to decode the blocks from the error block to the N+P−1-th image frame according to the inter-frame coding technology. The motion vector information and the residue information of the inter-frame coding blocks in the N+P-th image frame are retrieved to perform decoding according to the inter-frame coding technology.

A coding algorithm encodes consecutive frames of a video sequence and realizes distributed Gradual Decoding Refresh. The consecutive frames include a first frame, a second frame, and a third frame, and each frame is composed of (X+Y+Z) columns of coding tree units. The algorithm includes: coding X columns of the first frame in an intra coding manner and coding the other columns of the first frame in an inter coding manner and/or the intra coding manner; coding X columns of the second frame in the inter coding manner, coding Y columns of the second frame in the intra coding manner, and coding Z columns of the second frame in the inter and/or intra coding manner(s); and coding X and Y columns of the third frame in the inter coding manner, and coding Z columns of the third frame in the intra coding manner. The X/Y/Z columns (intra-coded columns) are inconsecutive.

Coding algorithm for realizing distributed gradual decoding refresh

A method for compressing images based on joint photographic experts group (JPEG) standard includes: compressing data of one or more first image blocks with a first compression level to produce compression data of the one or more first image blocks; adjusting the first compression level to obtain a second compression level according to at least one of a data size-related index regarding the compression data of the one or more first image blocks or a transmission-related index regarding transmission of the compression data of the one or more first image blocks; and compressing data of a second image block with the second compression level.

Method and apparatus of image compression with bit rate control

The present invention provides an encoder including a quantization circuit, a control circuit and an encoding circuit is disclosed. The quantization circuit is configured to generate quantized data corresponding to a CTU according to image data, wherein the CTU comprises at least one TU. The control circuit is configured to determine a number of allocated bits for each TU in the CTU, where the number of allocated bits for each TU is determined based on a sum of remaining bits of the TUs that have been encoded. The encoding circuit is configured to encode each TU to obtain encoded data according to the number of allocated bits of the TU in the CTU.

Encoder and associated signal processing method

The present invention provides an encoder including a quantization circuit, an encoding circuit, an energy parameter calculation circuit and a quantization parameter determination circuit. The quantization circuit is configured to perform quantization operations on a plurality of CTUs in image data in sequence to generate quantized data respectively corresponding to the plurality of CTUs. The encoding circuit is configured to perform encoding operations on the quantized data of the plurality of CTUs in sequence to generate encoded data. The energy parameter calculation circuit is configured to receive the image data, and calculate a plurality of energy parameters respectively corresponding to the plurality of CTUs in the image data. The quantization parameter determination circuit is configured to determine a plurality of quantization parameters of the plurality of CTUs according to at least a portion of the plurality of energy parameters, for the quantization circuit to perform the quantization operations.

The present invention provides a receiver including a decoder, an upscale circuit and a color space conversion circuit. The decoder is configured to decode a video stream to generate a base layer and an enhancement layer. The upscale circuit is configured to perform an upscaling operation on the base layer to generate an upscaled base layer, wherein the upscaled base layer comprises luminance values of a plurality of pixels of a frame, and the enhancement layer comprises residuals of the plurality of pixels of the frame. The color space conversion circuit is configured to use a conversion matrix to combine the upscaled base layer and the enhancement layer to generate output video data.

Method for processing LCEVC enhancement layer of residuals

A loop filter utilized in an encoder includes a constrained directional enhancement filter and a decision circuit. The constrained directional enhancement filter is arranged to process multiple frames, wherein for a first frame in the multiple frames, the constrained directional enhancement filter determines a best filter strength of each block in the first frame in a first filter strength list, and determines a second filter strength list according to content of the first frame. The decision circuit is coupled to the constrained directional enhancement filter, and is arranged to record which index in the first filter strength list is the best filter strength corresponding to each block in the first frame, and provide the first filter strength list and the index corresponding to each block to an encoding circuit of the encoder as an output of the encoder.

Loop filter utilized in encoder and associated signal processing method

A prediction circuit in an encoder utilizes a specific partition mode to process a super block for generating a plurality of reconstructed pixel values for each block in the super block, and the reconstructed pixel values of each block are directly utilized as reference pixels for other blocks to perform intra-frame prediction, so as to improve the efficiency of the encoder.

An encoder includes a frame level processing circuit, a coding tree unit (CTU) level processing circuit and an encoding circuit. The frame level processing circuit is arranged to calculate a bit number of a current frame according a target bitrate and a frame rate, and the frame level processing circuit is further arranged to calculate a quantization parameter of the current frame according to the bit number of the current frame and at least one parameter. The CTU level processing circuit is arranged to use an adaptive quantization mode to adjust the quantization parameter to generate an adjusted quantization parameter. The encoding circuit is arranged to encode the current frame to generate output data according to the adjusted quantization parameter.

Encoder using coding tree unit level adaptive quantization mode to adjust frame level quantization parameter and associated signal processing method

A bit rate control method includes the following operations: receiving a first target bit of a video to be coded; determining a second target bit for first coding tree units (CTUs) in CTUs of the video according to the first target bit; determining a fourth target bit of at least one fourth CTU in the CTUs according to an actual bit of at least one second CTU in the CTUs and a third target bit of at least one third CTU in the CTUs, in which the at least one second CTU is completely coded, the at least one third CTU is not completely coded, and a coding of the at least one fourth CTU is not started; and sequentially adjusting at least one coding parameter for coding the video according to the second target bit, the third target bit, and the fourth target bit.

Bit rate control method and video processing device

Disclosed is a deblocking filter level decision method applicable to an image encoder and used for determining deblocking filter levels of N image frames. The method includes: determining whether a current quantization parameter of a current frame of the N image frames is the same as a previous quantization parameter of any previous frame of the N image frames; if the current quantization parameter is different from the previous quantization parameter, looking up M current deblocking filter reference levels in an established table according to the current quantization parameter and then determining M current deblocking filter levels of the current frame according to the M current deblocking filter reference levels, respectively; and if the current quantization parameter is the same as the previous quantization parameter, determining the M current deblocking filter levels of the current frame according to M previous deblocking filter levels of the previous frame, respectively.

Deblocking filter level decision method

A selection module for selecting an intra mode comprises a histogram of oriented gradient (HOG) module, for receiving a coding unit (CU), to select four angular modes from 33 angular modes of the CU, a DC mode of the CU and a planar mode of the CU; and a decision module, couple to the HOG module, for receiving the six modes from the HOG module, to compare the six modes according to a Split Sum of Absolute Transformed Difference (SSATD) algorithm, to select one of the six modes.

Device and method of selecting an intra mode of a coding unit

A transmitter for handling multiple formats of a video sequence, comprises a preprocessing module, for receiving a first format of a video sequence, to generate metadata of a second format of the video sequence according to the first format of the video sequence and the second format of the video sequence; and an encoder, couple to the preprocessing module, for transmitting the first format of the video sequence and the metadata in a bit stream to a receiver.

Device and method of handling multiple formats of a video sequence

A decoding method is adapted to be implemented using a Context-based Adaptive Binary Arithmetic Coding (CABAC) decoding apparatus, and includes: initializing a plurality of context variables; storing the context variables; performing arithmetic decoding of a syntax element according to the context variables so as to output a decoded syntax element and an update signal; and updating at least one of the context variables according to the update signal. At least one of the context variables is pre-initialized in the initializing step before a bit stream ready.

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Cupertino, CA, United States of America

Chi-Wang Chai